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The word act, as used in the term Act of Congress, is a common, not a proper noun. The capitalization of the word act is deprecated by some dictionaries and usage authorities. Some writers, in particular the U.S. Code, capitalize Act.
At first glance, the rules of English capitalization seem simple. You probably know you should capitalize proper nouns and the first word of every sentence. But you also (sometimes) capitalize the first word of a quote. Usually you donât capitalize after a colon, but there are exceptions.